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TPSI3050-Q1: Continuous Drive

Mable Wan
Prodigy 40 points
Part Number: TPSI3050-Q1

Hi - I would like to use this part to control a MOSFET that I'm using in a precharge circuit. Can this part be drive the mosfet continuously, i.e. keep the mostfet closed? If yes, what Rpxfr should I use since there is no duty cycle?  

  • 0
    TI__Expert 5306 points

    Hello Mable,

    Thanks for reaching out to our team on E2E. Yes, TPSI305x-Q1 can be used to continuously drive a MOSFET. To better assist you, can you please share more details about your application such as:

    • MOSFET P/N
      • Is there a time requirement for first driving the MOSFET? (e.g. MOSFET needs to close in under 10-ms from power on) 

    What I'm getting at is that the R_PXFR value will affect how quickly the TPSI305x-Q1 can drive the MOSFET from power on. If you want to check the numbers yourself, please take a look at the TPSI305x-Q1 Calculator Tool (SLVRBI9) and input your system specs.

    Best regards,
    Tilden Chen

    Solid State Relays | Applications Engineer

  • 0 in reply to Tilden Chen
    Prodigy 40 points

    Hi - There is no time requirement for me. So as long as EN is HIGH, then the FET will be driven high. 

    thank you!

  • 0 in reply to Mable Wan
    TI__Expert 5306 points

    Hello Mable,

    In pre-charge applications, we typically see an overall pre-charge time requirement (e.g. 400-ms). Once you have a MOSFET selected, I would encourage you to use the aforementioned TPSI305x-Q1 Calculator Tool (SLVRBI9), input the MOSFET total gate charge, and determine whether the t_start is appropriate for a given R_PXFR.

    For example, if your overall pre-charge time requirement is 10-ms and you have selected a MOSFET with 100-nC total gate charge, then perhaps you might not want to select the lowest duty cycle in the event your system is expected to take 8-ms to charge since the t_start would take 3.3-ms .

    Best regards,
    Tilden Chen

    Solid State Relays | Applications Engineer